Anxiety can have a vast array of symptoms, but just because one suffers from anxiety, doesn't mean that all symptoms we incur are caused by it. As you mentioned, it would probably be a good idea for you to see your doctor.
Muscle cramps may be caused by vitamin deficiencies, drugs, lactic acid, dehydration, and low calcium, potassium, or magnesium.
Good luck to you in finding some relief. The best to you, Arib!... Chuck